21080862 has 36 divisors (see below), whose sum is σ = 50210160. Its totient is φ = 6387480.

The previous prime is 21080849. The next prime is 21080869. The reversal of 21080862 is 26808012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080869) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2662 + ... + 7017.

Almost surely, 2^21080862 is an apocalyptic number.

21080862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21080862 is an abundant number, since it is smaller than the sum of its proper divisors (29129298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21080862 is a wasteful number, since it uses less digits than its factorization.

21080862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9709 (or 9695 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21080862 is about 4591.3899856144. The cubic root of 21080862 is about 276.2460785805.

Adding to 21080862 its reverse (26808012), we get a palindrome (47888874).

The spelling of 21080862 in words is "twenty-one million, eighty thousand, eight hundred sixty-two".